Merge branch 'release_0818' into 'main'

Updated changelog in preparation for release

See merge request !40

CHANGELOG.md

@@ -4,7 +4,9 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
-## [Unreleased](https://github.com/usgs/waterdataui/compare/waterdataui-0.49.0...master)
+## [Unreleased](https://github.com/usgs/waterdataui/compare/waterdataui-0.50.0...master)
+
+## [0.50.0](https://github.com/usgs/waterdataui/compare/waterdataui-0.49.0...waterdataui-0.50.0) - 2021-08-18
 ### Changed
 - The NWIS site service and sifta service now use aiohttp and are called concurrently in the monitoring_location view.
 - Components comprising the hydrograph component are rendered as much as possible before client side data is received. This limits the amount of content shifting that happens.